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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kapreallan Engineering, Inc Client-Project 1D Unocal#4421,7303 PacEfic Ave,Stockton Sampled Nov 9, 1992 <br /> 2401 Stanwell Drive, Suite 400 Sample Matrix Soil Received Nov 11, 1992 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Nov 25, 1992 <br /> Attention Mardo Kaprealian, P E First Sample# 211-0478 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D. I.D I D I D 1 D I D <br /> mg/kg 211-0478 211-0479 211-0480 211-0481 211-0482 211-0483 <br /> EB2-(35) EB2-(40) EB2-(45) EB2-(50) EB2-(55) EB2-(57 5) <br /> Purgeable <br /> Hydrocarbons 10 N D N D N D N D N D N D <br /> Benzene 0 005 N D N D N D 00056 N D N D <br /> Toluene 0 005 N D N D N D 00056 N D N D <br /> Ethyl Benzene 0 005 N D N D N D 00055 N D N D <br /> Total Xylenes 0 005 N D N D N D 0 022 N D N D <br /> Chromatogram Pattern <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 10 10 10 10 <br /> Date Analyzed 11/13/92 11/13/92 11/13/92 11/13/92 11/16/92 11/13/92 <br /> Instrument Identification HP-5 HP-5 HP-5 HP-5 HP-2 HP-5 <br /> Surrogate Recovery, % 105 109 110 107 94 104 <br /> (CSC Limits = 70-130°x) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL <br /> ZACh e <br /> Project Manager 2110460 KEI <4> <br />